(19)
(11) EP 0 172 627 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.12.1987 Bulletin 1987/52

(43) Date of publication A2:
26.02.1986 Bulletin 1986/09

(21) Application number: 85304576

(22) Date of filing: 26.06.1985
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 02.07.1984 US 627867

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
 ()

(72) Inventor:
  • Lee, Denny Lap Yen
     ()

   


(54) Radioactive material billing system and method


(57) Quantities of radioactive material are dispersed at a user location. Billing is accomplished by monitoring the decay of material and the degree of activity following each user withdrawal.






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